thirdparty/google_appengine/google/appengine/ext/webapp/util.py
author Daniel Hans <Daniel.M.Hans@gmail.com>
Tue, 10 Nov 2009 18:18:06 +0100
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#!/usr/bin/env python
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#
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# Copyright 2007 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#     http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""Convience functions for the Webapp framework."""
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__all__ = ['login_required',
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           'run_wsgi_app',
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           'add_wsgi_middleware',
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           'run_bare_wsgi_app',
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           ]
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import os
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import sys
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import wsgiref.util
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from google.appengine.api import users
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from google.appengine.api import lib_config
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from google.appengine.ext import webapp
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def login_required(handler_method):
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  """A decorator to require that a user be logged in to access a handler.
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  To use it, decorate your get() method like this:
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    @login_required
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    def get(self):
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      user = users.get_current_user(self)
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      self.response.out.write('Hello, ' + user.nickname())
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  We will redirect to a login page if the user is not logged in. We always
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  redirect to the request URI, and Google Accounts only redirects back as a GET
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  request, so this should not be used for POSTs.
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  """
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  def check_login(self, *args):
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    if self.request.method != 'GET':
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      raise webapp.Error('The check_login decorator can only be used for GET '
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                         'requests')
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    user = users.get_current_user()
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    if not user:
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      self.redirect(users.create_login_url(self.request.uri))
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      return
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    else:
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      handler_method(self, *args)
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  return check_login
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_config_handle = lib_config.register(
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    'webapp',
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    {'add_wsgi_middleware': lambda app: app})
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def run_wsgi_app(application):
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  """Runs your WSGI-compliant application object in a CGI environment.
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  Compared to wsgiref.handlers.CGIHandler().run(application), this
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  function takes some shortcuts.  Those are possible because the
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  app server makes stronger promises than the CGI standard.
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  Also, this function may wrap custom WSGI middleware around the
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  application.  (You can use run_bare_wsgi_app() to run an application
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  without adding WSGI middleware, and add_wsgi_middleware() to wrap
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  the configured WSGI middleware around an application without running
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  it.  This function is merely a convenient combination of the latter
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  two.)
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  To configure custom WSGI middleware, define a function
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  webapp_add_wsgi_middleware(app) to your appengine_config.py file in
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  your application root directory:
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    def webapp_add_wsgi_middleware(app):
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      app = MiddleWareClassOne(app)
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      app = MiddleWareClassTwo(app)
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      return app
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  You must import the middleware classes elsewhere in the file.  If
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  the function is not found, no WSGI middleware is added.
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  """
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  run_bare_wsgi_app(add_wsgi_middleware(application))
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def add_wsgi_middleware(application):
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  """Wrap WSGI middleware around a WSGI application object."""
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  return _config_handle.add_wsgi_middleware(application)
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def run_bare_wsgi_app(application):
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  """Like run_wsgi_app() but doesn't add WSGI middleware."""
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  env = dict(os.environ)
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  env["wsgi.input"] = sys.stdin
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  env["wsgi.errors"] = sys.stderr
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  env["wsgi.version"] = (1, 0)
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  env["wsgi.run_once"] = True
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  env["wsgi.url_scheme"] = wsgiref.util.guess_scheme(env)
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  env["wsgi.multithread"] = False
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  env["wsgi.multiprocess"] = False
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  result = application(env, _start_response)
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  if result is not None:
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    for data in result:
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      sys.stdout.write(data)
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def _start_response(status, headers, exc_info=None):
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  """A start_response() callable as specified by PEP 333"""
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  if exc_info is not None:
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    raise exc_info[0], exc_info[1], exc_info[2]
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  print "Status: %s" % status
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  for name, val in headers:
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    print "%s: %s" % (name, val)
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  print
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  return sys.stdout.write